I have been reading a lot of SCP's trying to figure out how I want to set up containment for the new SCP I am writing. I know that I want to put it in a room, but that is about the only thing that I am sure of. Is there any "rule" that is set as to how containment in a room is set up vs. what the SCP is/can do, or is it really just all personal preference? How do you guys decide what to contain your SCP's in?